Malicious PDF — malware analysis report

Static analysis result for SHA-256 c101bf1b93407099…

MALICIOUS

PDF

82.2 KB Created: 2021-08-17 06:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 33c1b06147684ac2ecd17bc5f079f432 SHA-1: 0f7f26b976309d9edc1e2e7e4d6a54edce4e6490 SHA-256: c101bf1b93407099eb1478324d69fb188cb5bf92bcd68e791832200b7b542a62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to multiple external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and the heuristic firings for link farms and compromised CMS uploads support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://binhvi.com/upload/files/finemipexikuz.pdf In PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/80503380586.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/sh6clgpq8feme8c82kddrb4423/52839679921.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-6/20210506120459290319.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/fesuzuda.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085dbc1ef4e2---bosuro.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/1982775319.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/2711e0b4f8930f4550a7cb0b968d65a5/20626860580.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/79ee593854c87fa99ad474f7e1f1b28e/nibumo.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/28290781550.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc92f61c5d---60353674383.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/96748768342.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/wixuname.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/8416318916.pdfIn PDF document text
    • http://vanhacollection.com/images/files/32266520164.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/kpt42cq6fia23onu73enlhkqh0/fevanubejegan.pdfIn PDF document text
    • http://seja.lv/assets/ckfinder/core/connector/php/uploads/files/zuwoj.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/95332727021.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/92676966790.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609d99be5b711---wemagenupexu.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210602052658.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/7ea880aec5554af42023ace673995b12/sekuvoresenevobena.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0746901001624214005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=instagram+verified+blue+tick+emoji+copy+and+pastePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAD 18188 bytes
SHA-256: e9ff68304ffdb42f4521ab3eacea1173ea74334e16e9eb10d33a671cbf9c6275
font_02_sfnt_off00011f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F57 11556 bytes
SHA-256: 37d90a235ae9ddfe8225974778f1012459c7f9a93e2a7d26be401f6ed834261e

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